Ejecting device for bolts from the matrix of a bolt press

ABSTRACT

A BOLT PRESS WHICH INCLUDES EJECTOR PIN MEANS RECIPROCABLY SUPPORTED BY THE PRESS FRAME WHICH LATTER SUPPORTS AN EJECTOR LEVER OPERABLE TO ACTUATE AN EJECTOR PIN FOR EJECTING A BOLT WHILE AN INTERMEDIATE LEVER IS OERABLE TO ACTUATE THE EJECTOR LEVER. FIRST PIVOT MEANS PIVOTALLY SUPPORTS THE INTERMEDIATE LEVER AT ONE END PORTION THEREOF WHILE SLIDE MEANS SUPPORTING SAID FIRST PIVOT MEANS IS SLIDABLY SUPPORTED BY THE FRAME MEANS SO AS TO BE REMOVABLE IN AXIAL DIRECTION OF AND TOWARD AND AWAY FROM SAID EJECTOR PIN MEANS.THE SAID SLIDE MEANS SUPPORTS ABUTMENT MEANS FOR ABUTTING ENGAGEMENT WITH A CAN SURFACE AREA ON SAID INTERMEDIATE LEVER AND ADJUSTING MEANS ARE PROVIDED FOR ADJUSTING THE SLIDE MEANS, ACTUATING MEANS SUPPORTING BY SAID FRAME MEANS INCLUDING MOVABLE ARM MEANS CARRYING SECOND PIVOT MEANS PIVOTALLY   CONNECTING THE OTHER END PORTION OF THE INTERMEDIATE LEVER TO SAID ARM MEANS.

1971 H. NEBENDORF 3,619,835

I EJECTING DEVICE FOR BOLTS FROM THE MATRIX OF A BOLT PRESS Filed Jan. 28, 1969 5 Sheets-Sheet 1 max/11 DIE I794" N 1971 H. NEBENDORF EJEGTING DEVICE FOR BOLTS FROM THE MATRIX OF A BOLT PRESS 5 Sheets-Sheet 2 Filed Jan. 28, 1969 NOV. 16, 1971 NEBENDQRF 3,619,835

EJECTLNG DEVICE FOR BOLTS FROM THE MATRIX OF A BOLT PRESS Filed Jan. 28, 1969 5 Sheets-Sheet I5 1971 H. NEBENDORF EJECTING DEVICE FOR BOLTS FROM THE MATRIX OF A BOLT PRESS 5 Sheets-Sheet 4 Filed Jan. 28, 1969 NOV. 16, 1971 NEQENDQRF 3,619,835

EJECTING DEVICE FOR BOLTS FROM THE MATRIX OF A BOLT PRESS United States Patent 3,619,835 EJECTING DEVICE FOR BOLTS FROM THE MATRIX OF A BOLT PRESS Heinrich Nebendorf, Wuppertal-Ronsdorf, Germany, assignor to Gebr. Hilgeland, Wuppertal-Ronsdorf, German y Filed Jan. 28, 1969, Ser. No. 794,716 Claims priority, application Germany, Jan. 29, 1968, P 16 52 860.2 Int. Cl. 321d 45/00; B21k 1/44; B23g 9/00 U.S. Cl. 11 10 Claims ABSTRACT OF THE DISCLOSURE A bolt press which includes ejector pin means reciprocably supported by the press frame which latter supports an ejector lever operable to actuate an ejector pin for ejecting a bolt while an intermediate lever is operable to actuate the ejector lever. First pivot means pivotally supports the intermediate lever at one end portion thereof while slide means supporting said first pivot means is slidably supported by the frame means so as to be movable in axial direction of and toward and away from said ejector pin means. The said slide means supports abutment means for abutting engagement with a cam surface area on said intermediate lever and adjusting means are provided for adjusting the slide means, actuating means supported by said frame means including movable arm means carrying second pivot means pivotally connecting the other end portion of the intermediate lever to said arm means.

The present invention relates to an ejecting device for ejecting bolts from a matrix of a bolt press with a rotatable intermediate lever which is adjustable and located between a cam and an ejector lever while acting upon said ejector lever for displacing the ejector pin against the pressure of a return spring. The intermediate lever is located in the plane of oscillation of the ejector lever and has the front portion of its back which eccentrically extends about the pivot point, in engagement with the back of the ejector lever while the pivot point of said intermediate lever is adjustable in the axial direction of the ejector pin by means of an adjusting spindle movable in the machine frame in said axial direction. In additional to an elevation which protrudes relative to the base circle and is intended for the ejecting operation, the cam has another area with a contour differing from the base circle for automatically offsetting the ejector lever prior to the postpressing operation. Such ejecting device is described in German Patent 1,215,479.

For purposes of pressing complicated bolt head shapes, it is known prior to the pre-upsetting, to set the ejector pin back to a certain extent whereby it becomes possible during the postpressing operation also to produce difficult bolt head shapes. With this heretofore known arrangement, the intermediate lever has at the level of its bearing eye a decreasing eccentric curvature which in cooperation with a depression of the driving camsaid depression extending below the base circle-will make it possible to set back the ejector lever and thereby the ejector pin. This known arrangement, however, has the drawback that the back setting stroke of the ejector lever is dependent on the respectively adjusted length of the bolt. Depending on whether a short or long length for the bolt has been adjusted by means of the adjusting spindle, the setting back stroke of the ejector lever will be longer or shorter.

A further drawback is seen in the fact that with this ice known arrangement for obtaining the setting back stroke of the ejector pin, also the relationship between the ejector lever and the intermediate lever will within certain limits change in conformity with the respective adjustment of the bolt length.

The above mentioned drawbacks are due primarily to the fact that the decreasing eccentric round contour has to merge with the substantially rectilinear back portion of the intermediate lever. Changes in the back setting stroke are, therefore, with this known device unfavorable with differently adjusted bolt lengths.

It is, therefore, an object of the present invention to provide an ejecting device in which the back setting stroke of the ejector pin will be independent of the respectively adjusted bolt length.

This object and other objects and advantages of the invention will appear more clearly from the following specification in connection with the accompanying drawings, in which:

FIG. 1 illustrates partially in section and partially in view the basic position of the ejecting device according to the present invention.

FIG. 2 represents a section taken along the line IIII of FIG. 1.

FIG. 3 illustrates the ejecting device according to FIG. 1 but shows the ejecting device after the ejector pin or ejector lever has been set back.

FIG. 4 shows the drive or driving connection for the intermediate lever.

FIG. 5 represents a section through the drive connection according to FIG. 4, said section being taken along the line V-V of FIG. 4.

The ejecting device according to the present invention is characterized primarily in that the pivot point of the intermediate lever is movably guided in the axial direction of the ejector pin and that the back portion of the intermediate lever which back portion extends around said pivot point and faces away from the ejector lever has a curvature the spacing of which with regard to said pivot point changes in a continuous manner, said curvature resting against a hearing which is adjustable by means of an adjusting spindle in axial direction relative to the machine frame.

An arrangement according to the present invention brings about that the intermediate lever will be able, independently of the adjusted bolt length, when carrying out an angular movement about its pivot point, always to carry out a back setting or forward setting movement in conformity with said angular movement, An advancing or forward setting of the ejector pin prior to the postpressing operation or a setting back of the ejector pin prior to the upsetting operation is advantageous when it is desired on horizontally operating double pressure presses to produce short cylindrical parts without head. These parts are by setting back the ejector pin prior to the presetting operation, first centered so that they cannot be upset unilaterally. Only after the preupsetting operation, the ejector pin is again set forward in connection with which the preupset bolt will in view of the preupsetting operation center itself.

The above mentioned curvature on that back portion of the intermediate lever which faces away from the ejector lever may have for instance the contour of a spiral. As counter bearing for this curvature there may be used one or a plurality of rollers.

According to a special feature of the present invention, that back portion of the intermediate lever which faces away from the ejector lever has a curvature which is eccentric to the pivot point and which rests against a bolt which is rotatably journalled in the bearing and has a recess with the same curvature. This particular embodiment has the advantage that it can easily be produced.

According to a further development of this special feature, the said back portion of the intermediate lever which faces away from the ejector lever, and the bolt are exchangeably arranged. This brings about that with always the same angular movements of the intermediate lever, it is possible for purposes of setting back or setting forward the ejector pin, to obtain different strokes in conformity with the respective selected back portion and the bolt pertaining thereto. This possibility is very important on a double pressure press to produce parts which require different backsetting strokes in order to obtain different head contours. With the preferred embodiments of the said curvature and the bearing cooperating with the curvature, a fast exchange of the respective parts will be possible. In order to make sure that the intermedite lever with its pivot point can in the machine frame be movably guided in the direction of the ejector pin, the pivot shaft of said intermediate lever may be provided with flattened portions by means of which it is guided in corresponding guiding means in the machine frame. Furthermore, it is possible on the pivot shaft rotatably to arrange a coulisse member which is guided in corresponding guiding means in the machine frame.

In order to assure that the double pressure press will also work Without play at high speeds of the press, according to a further feature of the invention, the intermediate lever is by means of an oscillating arm driven by double cam discs which are journalled in stationary bearing means in the machine frame. Rollers arranged at one end of said oscillating arm and located diagrammatically opposite to each other With regard to the driving shaft of said cam discs, are adapted to roll on said cam discs. For purposes of guiding said oscillating arm there is provided a coulisse member which is rotatably mounted on the driving shaft for the double cam discs. The said oscillating arm is by corresponding guiding means guided on the coulisse member in the direction along a line conecting the centers of the pivot points of the rollers.

In order to protect the press and especially the ejecting device against overload, the connection of the said oscillating arm with the intermediate lever has arranged thereon a break plate or the like which in response to an overload disengages the driving connection. In order quickly to stop the machine, a switch is actuated by a then relaxed spring which switch turns off the motor and for purposes of producing a counter current brake reverses the polarity of the motor.

Referring now to the drawings in detail, FIG. 1 shows an ejector lever 1 which is rotatably journalled on a pivot 2. The pivot 2 is connected to the machine frame 3. The ejector lever 1 is provided with a head portion 1 which engages the ejector pin 4. The ejector pin 4 is movably guided in a bore of the matrix. Arranged in the machine frame 3 is a pressure spring 5 which is adapted through a pushrod 6 to act upon that side of the ejector lever 1 which faces the ejector pin 4. That portion of the back part 1" of the ejector lever 1 which faces away from the ejector pin 4 engages the back portion 7 of an intermediate lever 7 which latter is rotatably journalled on a bolt 8. The bolt 8 has its ends provided with flattened portions 8' by means of which it is guided in guiding means 9. The guiding means 9 are provided in a bearing member 10 which in its turn is guided in the machine frame 3 in the axial direction of the ejector pin 4. The guiding member 10 has that side thereof which faces away from the ejector pin 4 in engagement with an adjusting spindle 11 which is threadedly arranged in the machine frame 3. The adjusting spindle 11 serves for adjusting the respective desired length of the bolt to be produced.

In conformity with the present invention, the pivot bolt 8 of the intermediate lever 7 is, as mentioned above, movable in the axial direction of the ejector pin 4. That back portion 7" of the intermediate lever 7 which extends about the pivot bolt 8 of lever 7 and faces away from the ejector lever 1 has a curvature the distance of which from said pivot bolt changes in -a continuous manner. The said curvature rests against the bearing member .10, which by means of the adjusting spindle 11 is adjustable relative to the machine frame in the axial direction of the ejector pin 4, through the intervention of a bolt 12 which is rotatably journalled in the bearing member 10 and has a recess corresponding to the curvature of the back portion 7". The other end of the intermediate lever 7 is through the intervention of a bolt 13 pivotally connected to an arm 14 having rotatably journalled thereon rollers 15 and 16. The roller 15 is in operative engagement with the cam disc 17, and the roller 16 is in operative engagement with the cam disc 18. The double cam disc 17, 18 is connected to the drive shaft 19 which latter is automatically driven by the machine shaft of the bolt press. The rollers 15 and 16 are diametrically oppositely located to each other with regard to the drive shaft 19. The drive shaft 19 furthermore has pivotally mounted thereon a coulisse member 20 which is guided in guiding means 21 provided in arm 14. The coulisse member 20 is movably guided in the direction of the connecting line of the axes of the rollers 15 and 16.

FIG. 3 shows the ejecting device according to the invention in its position prior to the postpressing of a bolt or the like while the ejecting lever 1 has been set back by the amount x.

The arrangement shown in FIGS. 1 to 3 operates in the following manner: The drive shaft 19 rotates for instance in the manner illustrated. Together with the drive shaft 19, the double cam disc 17, 1 8 will rotate so that the roller 16 will roll on the cam disc 18. In view of the employment of the double cam discs 17 18 and the two rollers 15 and 16, a positive and play-free transmission of the cam contour of the double cam discs 17, 18 with regard to the movement of the arm 14 will be assured. By means of the coulisse member 20 the arm 14 is displaceably guided in the direction of the connecting line of the axes of the rollers 15 and 16.

During the rotation of the double cam discs 17, 18, the rollers 15 and 16 will after an effected preupsetting move into a cam range 17', 18 below the visualized base circle. This condition is illustrated in FIG. 3. What is meant by the visualized base circle can be answered in part by referring to FIG. 4 of US. Pat. 3,266,071-Nebendorf issued Aug. 16, 1966. With the base circle, there is meant that basis which serves as the reference line for definition of raised and lowered portions on a curved disc or cam means. Single and double dotted-dashed lines in FIG. 3 represent the Visualized base circle of cam disc means (17, 18). The intermediate lever 7 has correspondingly moved in clockwise direction by a certain angle. In conformity with this angular movement of the intermediate lever 7, the eccentric back portion 7" will be spaced from the corresponding recess in bolt 12. In view of the force exerted by the pressure spring 5 through pushrod 6 and ejector lever 1 upon the intermediate lever 7, the latter moves with its bolt 8 serving as pivot bearing in the direction toward the bolt 12. The guiding means 9 will guide the bolt 8. The change in the position of the eccentric back portion 7 as brought about by the angular movement of the intermediate lever 7 is compensated for by the fact that the bolt 12 is pivotally arranged in the bearing member 10. After the ejector lever 1 and the ejector pin 4 have been set back, the work piece is postpressed and subsequently ejected. The ejector position of the ejector lever 1 is indicated in FIG. 3 in dot-dash lines.

By means of the adjusting spindle 11 through the bearing member 10, the bolt 12, the intermediate lever 7 and the ejector lever 1, the ejector pin 4 can be adjusted for each desired length of the bolt. This adjustment will, in conformity with the present invention, exert no influence on a certain desired back setting stroke of the ejector pin prior to the postpressing. The magnitude of the back setting stroke is determined solely by the magnitude of the depression below the base circle which depression pertains to the cam disc or cam discs, and by the selection of the eccentric curvature 7". In order to be able to adjust the ejecting device according to the invention in a fast and simple manner for different back setting strokes, according to a special feature of the invention, the intermediate lever 7 has detachably connected thereto a lever head member 7" which comprises the eccentric curvature 7". The connection of the lever head member 7" may be efiected for instance by screws. Simultaneously with the exchange of a lever head member 7", it is necessary to insert a corresponding bolt 12 with a corresponding recess.

That portion of the back 7 of the intermediate lever 7 which in the base position of the ejecting device engages the ejector lever 1 within the region of the bolt 8 is advantageously so designed that it extends concentrically around the pivot point. This has the advantage that each ejecting operation starts independently of the respectively adjusted bolt length with the same favorable desired lever ratio as has been described in the above mentioned German Patent 1,215,479. Furthermore, such concentric design of the said mentioned portion of the intermediate lever 7 also prevents a change in the magnitude of the back setting stroke with different bolt lengths.

FIGS. 4 and 5 show the drive for the intermediate lever 7 by means of the arm 14. The double cam discs 17, 18 are by means of a key 22 connected to the drive shaft 19. Furthermore, the coulisse member is rotatably journalled on the drive shaft 19. Arm 14 is by the guiding means 21 guided on the coulisse member 20. The rollers 15 and 16 the axes of which together with pivot point of the drive shaft 19 are located on one straight line transmit the movements produced by cam disc 17, 18 to the arm 14. The roller 16 and the cam disc 18 cooperating therewith are mechanically stronger than the roller 15 and the cam disc 17 cooperating therewith because roller 16 has to transmit forces which are necesary for the ejecting operation. The arm 14 transmits movements brought about by the cam discs 17, 18 through the intervention of bolt 13 to the intermediate lever 7. The bolt 13 is provided (-FIG. 4) with flattened portions 32 by means of which at the other end of arm 14 it is prevented from rotation in a fork-shaped recess not designated further. On that side of the bolt 13 which faces the said recess, there is provided a pressure member 23 which is guided in said recess. The pressure member 23 is by means of screws 24 and by means of a break plate 25 pressed against the corresponding flattened portion of the bolt 13. Plate 25 is by means of a threaded bolt 33 connected to the fork forming ends of the arm 14. Furthermore, one side of the bolt 13 which side is located opposite to the said recess is provided with a recess 27 engaged by one end of a loaded leaf spring 28. The leaf spring 28 is at 29 connected to the arm 14. Within the range of the leaf spring 28 the machine frame 3 has provided thereon arr electric switch 31 with a control pushrod or the like 30. The break plate 25 and the spring 28 in cooperation with the electric switch 31 form a safety device for protecting the machine against overload. The operation of this safety device is as follows: When the forces transmitted through bolt 13 to the intermediate lever 7 increase for some reason beyond a permissible extent, the bolt 13 will through the pressure member 23 or screws 24 destroy the break plate 25 at the area of said recesses 26. The bolt 13 and the pressure member 23 will in this instance be moved away from the rollers 15 and 16. As a result thereof, the loaded leaf spring will be released at one end thereof and movesaway from arm 14 to such an extent that the pushrod 30 of the electric switch 31 will be actuated. The electric switch 31 is located in the circuit of the drive motor and turns off the same. In order to keep damage to any machine parts as small as possible, it is advantageous to have the switch 31 reverse the polarity of the drive motor to produce a counter 6 current braking operation so that the machine will stop in a minimum of time.

It is, of course, to be understood that the present invention is, by no means, limited to the particular structure shown in the drawings but also comprises modifications within the scope of the appended claims.

What I claim is:

1. In combination with the frame means of a bolt press, an ejecting device for ejecting bolts independently of adjusted bolt length from a matrix on a bolt press, which includes: ejector pin means reciprocably supported by said frame means, an ejector lever pivotally supported by said frame means and operable to actuate said ejector pin means for ejecting a bolt, an intermediate lever operable to actuate said ejector lever for ejecting a bolt, first pivot means pivotally supporting said intermediate lever at one end portion thereof and having its axis extending in a direction transverse to the axis of said ejector pin means, slide means supporting said first pivot means and slidably supported by said frame means so as to be movable in the axial direction of and toward and away from said ejector pin means, said intermediate lever having a cam surface area facing away from said ejector lever, abutment means supported by said slide means for abuting engagement with said cam surface area, adjusting means adjustably supported by said frame means for selectively adjusting said slide means, said carn surface area continuously varying in distance from the axis of said first pivot means so that the distance of said engagement with said abutment means increases and decreases With movement of said adjusting and slide means away from and toward said ejector pin means respectively, actuating means supported by said frame means and including movable arm means, and second pivot means supported by said movable arm means and pivotally connecting the other end portion of said intermediate lever to said arm means.

2. An arrangement in combination according to claim 1, in which said abutment means is formed by a bolt, and in which said cam surface area is eccentric with regard to the axis of said last mentioned bolt, said last mentioned bolt being provided with recess means having a rounded surface area corresponding to and in engagement with said cam surface.

3. An arrangement in combination according to claim 1, in which said cam surface area of said intermediate lever forms a part of a member detachably connected to said intermediate lever.

4. An arrangement in combination according to claim 2, in which said last mentioned bolt is exchangeably mounted in said slide means.

5. An arrangement in combination according to claim 1, in which said first pivot means has flattened portions, and in which said slide means is provided with surface means slidably engaging said flattened portions.

6. An arrangement in combination according to claim 5, in which said surface means and the means for journalling said last mentioned bolt are formed by a single structural member.

7. An arrangement in combination according to claim 1, in which said actuating means comprises a drive shaft rotatably journalled in said frame means, a cam structure keyed to said drive shaft and provided with two axially spaced cams, a plurality of roller means supported by said arm means and respectively cooperating with said cams so as to be in rolling engagement therewith, and a coulisse member rotatably supported by said drive shaft and guiding said arm means in a direction of the plane extending through the axes of said roller means.

8. An arrangement in combination according to claim 7, which includes pressure plate means arranged at and connected to that end portion of said arm means which is pivotally connected to said intermediate lever, and pressure body means interposed between said pressure 1 plate means and said second pivot means and forming a portion of the bearing for the latter, said pressure body means together with said second pivot means being displaceable in said arm means in the direction of the acting force in response to the later bringing about a break of said pressure plate means.

9. An arrangement in combination according to claim 8, which includes preloaded spring means supported by said arm means, and switch means controlling the drive of said drive shaft and operable in response to the break of said pressure plate means to be actuated by said spring means for interrupting the drive of said drive shaft.

10. An arrangement in combination according to claim 9, which includes a drive motor for said drive shaft and in which said switch means is operable in response to being actuated by said spring means to change the polarity of said drive motor for said drive shaft.

References Cited UNITED STATES PATENTS 4/1936 Clouse 10-12 12/1963 Hoyt 1012 11/1964 Carlson 1011 11/1964 Carlson 10-11 3/1965 Maistros 10-12 3/1966 Hoyt 1011 1/1967 Van de Meerendonk 1012 8/1966 Nebendorf 1011 4/ 1969 Byam et al 1012 CHARLES W. LANHAM, Primary Examiner 15 E. M. COMBS, Assistant Examiner US. Cl. X.R. 

